cmd/utils: don't enumerate USB unless --usb is set (#22130)

USB enumeration still occured. Make sure it will only occur if --usb is set.
This also deprecates the 'NoUSB' config file option in favor of a new option 'USB'.

node/api_test.go

@@ -248,7 +248,6 @@ func TestStartRPC(t *testing.T) {
 			// Apply some sane defaults.
 			config := test.cfg
 			// config.Logger = testlog.Logger(t, log.LvlDebug)
-			config.NoUSB = true
 			config.P2P.NoDiscovery = true
 
 			// Create Node.